/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ * This file contains functions for reading and writing identity files, and
+ * for reading the passphrase from the user.
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ *
+ * Copyright (c) 2000 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
-authfile.c
-
-Author: Tatu Ylonen <ylo@cs.hut.fi>
-
-Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- All rights reserved
-
-Created: Mon Mar 27 03:52:05 1995 ylo
-
-This file contains functions for reading and writing identity files, and
-for reading the passphrase from the user.
-
-*/
-
-#include "config.h"
#include "includes.h"
-RCSID("$Id$");
+RCSID("$OpenBSD: authfile.c,v 1.28 2001/02/21 09:05:54 deraadt Exp $");
-#ifdef HAVE_OPENSSL
-#include <openssl/bn.h>
-#endif
-#ifdef HAVE_SSL
-#include <ssl/bn.h>
-#endif
+#include <openssl/err.h>
+#include <openssl/evp.h>
+#include <openssl/pem.h>
+#include "cipher.h"
#include "xmalloc.h"
#include "buffer.h"
#include "bufaux.h"
-#include "cipher.h"
+#include "key.h"
#include "ssh.h"
+#include "log.h"
+#include "authfile.h"
/* Version identification string for identity files. */
-#define AUTHFILE_ID_STRING "SSH PRIVATE KEY FILE FORMAT 1.1\n"
+static const char authfile_id_string[] =
+ "SSH PRIVATE KEY FILE FORMAT 1.1\n";
-/* Saves the authentication (private) key in a file, encrypting it with
- passphrase. The identification of the file (lowest 64 bits of n)
- will precede the key to provide identification of the key without
- needing a passphrase. */
+/*
+ * Saves the authentication (private) key in a file, encrypting it with
+ * passphrase. The identification of the file (lowest 64 bits of n) will
+ * precede the key to provide identification of the key without needing a
+ * passphrase.
+ */
int
-save_private_key(const char *filename, const char *passphrase,
- RSA *key, const char *comment)
+save_private_key_rsa1(const char *filename, const char *passphrase,
+ RSA *key, const char *comment)
{
- Buffer buffer, encrypted;
- char buf[100], *cp;
- int f, i;
- CipherContext cipher;
- int cipher_type;
- u_int32_t rand;
-
- /* If the passphrase is empty, use SSH_CIPHER_NONE to ease converting to
- another cipher; otherwise use SSH_AUTHFILE_CIPHER. */
- if (strcmp(passphrase, "") == 0)
- cipher_type = SSH_CIPHER_NONE;
- else
- cipher_type = SSH_AUTHFILE_CIPHER;
-
- /* This buffer is used to built the secret part of the private key. */
- buffer_init(&buffer);
-
- /* Put checkbytes for checking passphrase validity. */
- rand = arc4random();
- buf[0] = rand & 0xff;
- buf[1] = (rand >> 8) & 0xff;
- buf[2] = buf[0];
- buf[3] = buf[1];
- buffer_append(&buffer, buf, 4);
-
- /* Store the private key (n and e will not be stored because they will
- be stored in plain text, and storing them also in encrypted format
- would just give known plaintext). */
- buffer_put_bignum(&buffer, key->d);
- buffer_put_bignum(&buffer, key->iqmp);
- buffer_put_bignum(&buffer, key->q); /* reverse from SSL p */
- buffer_put_bignum(&buffer, key->p); /* reverse from SSL q */
-
- /* Pad the part to be encrypted until its size is a multiple of 8. */
- while (buffer_len(&buffer) % 8 != 0)
- buffer_put_char(&buffer, 0);
-
- /* This buffer will be used to contain the data in the file. */
- buffer_init(&encrypted);
-
- /* First store keyfile id string. */
- cp = AUTHFILE_ID_STRING;
- for (i = 0; cp[i]; i++)
- buffer_put_char(&encrypted, cp[i]);
- buffer_put_char(&encrypted, 0);
-
- /* Store cipher type. */
- buffer_put_char(&encrypted, cipher_type);
- buffer_put_int(&encrypted, 0); /* For future extension */
-
- /* Store public key. This will be in plain text. */
- buffer_put_int(&encrypted, BN_num_bits(key->n));
- buffer_put_bignum(&encrypted, key->n);
- buffer_put_bignum(&encrypted, key->e);
- buffer_put_string(&encrypted, comment, strlen(comment));
-
- /* Allocate space for the private part of the key in the buffer. */
- buffer_append_space(&encrypted, &cp, buffer_len(&buffer));
-
- cipher_set_key_string(&cipher, cipher_type, passphrase, 1);
- cipher_encrypt(&cipher, (unsigned char *)cp,
- (unsigned char *)buffer_ptr(&buffer),
- buffer_len(&buffer));
- memset(&cipher, 0, sizeof(cipher));
-
- /* Destroy temporary data. */
- memset(buf, 0, sizeof(buf));
- buffer_free(&buffer);
-
- /* Write to a file. */
- f = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0600);
- if (f < 0)
- return 0;
-
- if (write(f, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
- buffer_len(&encrypted))
- {
- debug("Write to key file %.200s failed: %.100s", filename,
- strerror(errno));
- buffer_free(&encrypted);
- close(f);
- remove(filename);
- return 0;
- }
- close(f);
- buffer_free(&encrypted);
- return 1;
+ Buffer buffer, encrypted;
+ char buf[100], *cp;
+ int fd, i;
+ CipherContext ciphercontext;
+ Cipher *cipher;
+ u_int32_t rand;
+
+ /*
+ * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
+ * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
+ */
+ if (strcmp(passphrase, "") == 0)
+ cipher = cipher_by_number(SSH_CIPHER_NONE);
+ else
+ cipher = cipher_by_number(SSH_AUTHFILE_CIPHER);
+ if (cipher == NULL)
+ fatal("save_private_key_rsa: bad cipher");
+
+ /* This buffer is used to built the secret part of the private key. */
+ buffer_init(&buffer);
+
+ /* Put checkbytes for checking passphrase validity. */
+ rand = arc4random();
+ buf[0] = rand & 0xff;
+ buf[1] = (rand >> 8) & 0xff;
+ buf[2] = buf[0];
+ buf[3] = buf[1];
+ buffer_append(&buffer, buf, 4);
+
+ /*
+ * Store the private key (n and e will not be stored because they
+ * will be stored in plain text, and storing them also in encrypted
+ * format would just give known plaintext).
+ */
+ buffer_put_bignum(&buffer, key->d);
+ buffer_put_bignum(&buffer, key->iqmp);
+ buffer_put_bignum(&buffer, key->q); /* reverse from SSL p */
+ buffer_put_bignum(&buffer, key->p); /* reverse from SSL q */
+
+ /* Pad the part to be encrypted until its size is a multiple of 8. */
+ while (buffer_len(&buffer) % 8 != 0)
+ buffer_put_char(&buffer, 0);
+
+ /* This buffer will be used to contain the data in the file. */
+ buffer_init(&encrypted);
+
+ /* First store keyfile id string. */
+ for (i = 0; authfile_id_string[i]; i++)
+ buffer_put_char(&encrypted, authfile_id_string[i]);
+ buffer_put_char(&encrypted, 0);
+
+ /* Store cipher type. */
+ buffer_put_char(&encrypted, cipher->number);
+ buffer_put_int(&encrypted, 0); /* For future extension */
+
+ /* Store public key. This will be in plain text. */
+ buffer_put_int(&encrypted, BN_num_bits(key->n));
+ buffer_put_bignum(&encrypted, key->n);
+ buffer_put_bignum(&encrypted, key->e);
+ buffer_put_string(&encrypted, comment, strlen(comment));
+
+ /* Allocate space for the private part of the key in the buffer. */
+ buffer_append_space(&encrypted, &cp, buffer_len(&buffer));
+
+ cipher_set_key_string(&ciphercontext, cipher, passphrase);
+ cipher_encrypt(&ciphercontext, (u_char *) cp,
+ (u_char *) buffer_ptr(&buffer), buffer_len(&buffer));
+ memset(&ciphercontext, 0, sizeof(ciphercontext));
+
+ /* Destroy temporary data. */
+ memset(buf, 0, sizeof(buf));
+ buffer_free(&buffer);
+
+ fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
+ if (fd < 0)
+ return 0;
+ if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
+ buffer_len(&encrypted)) {
+ debug("Write to key file %.200s failed: %.100s", filename,
+ strerror(errno));
+ buffer_free(&encrypted);
+ close(fd);
+ unlink(filename);
+ return 0;
+ }
+ close(fd);
+ buffer_free(&encrypted);
+ return 1;
}
-/* Loads the public part of the key file. Returns 0 if an error
- was encountered (the file does not exist or is not readable), and
- non-zero otherwise. */
+/* save SSH2 key in OpenSSL PEM format */
+int
+save_private_key_ssh2(const char *filename, const char *_passphrase,
+ Key *key, const char *comment)
+{
+ FILE *fp;
+ int fd;
+ int success = 0;
+ int len = strlen(_passphrase);
+ char *passphrase = (len > 0) ? (char *)_passphrase : NULL;
+ EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
+
+ if (len > 0 && len <= 4) {
+ error("passphrase too short: %d bytes", len);
+ errno = 0;
+ return 0;
+ }
+ fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
+ if (fd < 0) {
+ debug("open %s failed", filename);
+ return 0;
+ }
+ fp = fdopen(fd, "w");
+ if (fp == NULL ) {
+ debug("fdopen %s failed", filename);
+ close(fd);
+ return 0;
+ }
+ switch (key->type) {
+ case KEY_DSA:
+ success = PEM_write_DSAPrivateKey(fp, key->dsa,
+ cipher, passphrase, len, NULL, NULL);
+ break;
+ case KEY_RSA:
+ success = PEM_write_RSAPrivateKey(fp, key->rsa,
+ cipher, passphrase, len, NULL, NULL);
+ break;
+ }
+ fclose(fp);
+ return success;
+}
int
-load_public_key(const char *filename, RSA *pub,
- char **comment_return)
+save_private_key(const char *filename, const char *passphrase, Key *key,
+ const char *comment)
{
- int f, i;
- off_t len;
- Buffer buffer;
- char *cp;
-
- /* Read data from the file into the buffer. */
- f = open(filename, O_RDONLY);
- if (f < 0)
- return 0;
-
- len = lseek(f, (off_t)0, SEEK_END);
- lseek(f, (off_t)0, SEEK_SET);
-
- buffer_init(&buffer);
- buffer_append_space(&buffer, &cp, len);
-
- if (read(f, cp, (size_t)len) != (size_t)len)
- {
- debug("Read from key file %.200s failed: %.100s", filename,
- strerror(errno));
- buffer_free(&buffer);
- close(f);
- return 0;
- }
- close(f);
-
- /* Check that it is at least big enought to contain the ID string. */
- if (len < strlen(AUTHFILE_ID_STRING) + 1)
- {
- debug("Bad key file %.200s.", filename);
- buffer_free(&buffer);
- return 0;
- }
-
- /* Make sure it begins with the id string. Consume the id string from
- the buffer. */
- for (i = 0; i < (unsigned int)strlen(AUTHFILE_ID_STRING) + 1; i++)
- if (buffer_get_char(&buffer) != (unsigned char)AUTHFILE_ID_STRING[i])
- {
- debug("Bad key file %.200s.", filename);
+ switch (key->type) {
+ case KEY_RSA1:
+ return save_private_key_rsa1(filename, passphrase, key->rsa, comment);
+ break;
+ case KEY_DSA:
+ case KEY_RSA:
+ return save_private_key_ssh2(filename, passphrase, key, comment);
+ break;
+ default:
+ break;
+ }
+ return 0;
+}
+
+/*
+ * Loads the public part of the key file. Returns 0 if an error was
+ * encountered (the file does not exist or is not readable), and non-zero
+ * otherwise.
+ */
+
+int
+load_public_key_rsa(const char *filename, RSA * pub, char **comment_return)
+{
+ int fd, i;
+ off_t len;
+ Buffer buffer;
+ char *cp;
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ return 0;
+ len = lseek(fd, (off_t) 0, SEEK_END);
+ lseek(fd, (off_t) 0, SEEK_SET);
+
+ buffer_init(&buffer);
+ buffer_append_space(&buffer, &cp, len);
+
+ if (read(fd, cp, (size_t) len) != (size_t) len) {
+ debug("Read from key file %.200s failed: %.100s", filename,
+ strerror(errno));
+ buffer_free(&buffer);
+ close(fd);
+ return 0;
+ }
+ close(fd);
+
+ /* Check that it is at least big enough to contain the ID string. */
+ if (len < sizeof(authfile_id_string)) {
+ debug3("Bad RSA1 key file %.200s.", filename);
+ buffer_free(&buffer);
+ return 0;
+ }
+ /*
+ * Make sure it begins with the id string. Consume the id string
+ * from the buffer.
+ */
+ for (i = 0; i < sizeof(authfile_id_string); i++)
+ if (buffer_get_char(&buffer) != authfile_id_string[i]) {
+ debug3("Bad RSA1 key file %.200s.", filename);
+ buffer_free(&buffer);
+ return 0;
+ }
+ /* Skip cipher type and reserved data. */
+ (void) buffer_get_char(&buffer); /* cipher type */
+ (void) buffer_get_int(&buffer); /* reserved */
+
+ /* Read the public key from the buffer. */
+ buffer_get_int(&buffer);
+ /* XXX alloc */
+ if (pub->n == NULL)
+ pub->n = BN_new();
+ buffer_get_bignum(&buffer, pub->n);
+ /* XXX alloc */
+ if (pub->e == NULL)
+ pub->e = BN_new();
+ buffer_get_bignum(&buffer, pub->e);
+ if (comment_return)
+ *comment_return = buffer_get_string(&buffer, NULL);
+ /* The encrypted private part is not parsed by this function. */
+
buffer_free(&buffer);
+
+ return 1;
+}
+
+/* load public key from private-key file */
+int
+load_public_key(const char *filename, Key * key, char **comment_return)
+{
+ switch (key->type) {
+ case KEY_RSA1:
+ return load_public_key_rsa(filename, key->rsa, comment_return);
+ break;
+ case KEY_DSA:
+ case KEY_RSA:
+ default:
+ break;
+ }
return 0;
- }
-
- /* Skip cipher type and reserved data. */
- (void)buffer_get_char(&buffer); /* cipher type */
- (void)buffer_get_int(&buffer); /* reserved */
-
- /* Read the public key from the buffer. */
- buffer_get_int(&buffer);
- pub->n = BN_new();
- buffer_get_bignum(&buffer, pub->n);
- pub->e = BN_new();
- buffer_get_bignum(&buffer, pub->e);
- if (comment_return)
- *comment_return = buffer_get_string(&buffer, NULL);
- /* The encrypted private part is not parsed by this function. */
-
- buffer_free(&buffer);
-
- return 1;
}
-/* Loads the private key from the file. Returns 0 if an error is encountered
- (file does not exist or is not readable, or passphrase is bad).
- This initializes the private key. */
+/*
+ * Loads the private key from the file. Returns 0 if an error is encountered
+ * (file does not exist or is not readable, or passphrase is bad). This
+ * initializes the private key.
+ * Assumes we are called under uid of the owner of the file.
+ */
int
-load_private_key(const char *filename, const char *passphrase,
- RSA *prv, char **comment_return)
+load_private_key_rsa1(int fd, const char *filename,
+ const char *passphrase, RSA * prv, char **comment_return)
{
- int f, i, check1, check2, cipher_type;
- off_t len;
- Buffer buffer, decrypted;
- char *cp;
- CipherContext cipher;
- BN_CTX *ctx;
- BIGNUM *aux;
- struct stat st;
-
- /* Read the file into the buffer. */
- f = open(filename, O_RDONLY);
- if (f < 0)
- return 0;
-
- /* We assume we are called under uid of the owner of the file */
- if (fstat(f, &st) < 0 ||
- (st.st_uid != 0 && st.st_uid != getuid()) ||
- (st.st_mode & 077) != 0) {
- error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
- error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
- error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
- error("Bad ownership or mode(0%3.3o) for '%s'.",
- st.st_mode & 0777, filename);
- error("It is recommended that your private key files are NOT accessible by others.");
- return 0;
- }
-
- len = lseek(f, (off_t)0, SEEK_END);
- lseek(f, (off_t)0, SEEK_SET);
-
- buffer_init(&buffer);
- buffer_append_space(&buffer, &cp, len);
-
- if (read(f, cp, (size_t)len) != (size_t)len)
- {
- debug("Read from key file %.200s failed: %.100s", filename,
- strerror(errno));
- buffer_free(&buffer);
- close(f);
- return 0;
- }
- close(f);
-
- /* Check that it is at least big enought to contain the ID string. */
- if (len < strlen(AUTHFILE_ID_STRING) + 1)
- {
- debug("Bad key file %.200s.", filename);
- buffer_free(&buffer);
- return 0;
- }
-
- /* Make sure it begins with the id string. Consume the id string from
- the buffer. */
- for (i = 0; i < (unsigned int)strlen(AUTHFILE_ID_STRING) + 1; i++)
- if (buffer_get_char(&buffer) != (unsigned char)AUTHFILE_ID_STRING[i])
- {
- debug("Bad key file %.200s.", filename);
+ int i, check1, check2, cipher_type;
+ off_t len;
+ Buffer buffer, decrypted;
+ char *cp;
+ CipherContext ciphercontext;
+ Cipher *cipher;
+ BN_CTX *ctx;
+ BIGNUM *aux;
+
+ len = lseek(fd, (off_t) 0, SEEK_END);
+ lseek(fd, (off_t) 0, SEEK_SET);
+
+ buffer_init(&buffer);
+ buffer_append_space(&buffer, &cp, len);
+
+ if (read(fd, cp, (size_t) len) != (size_t) len) {
+ debug("Read from key file %.200s failed: %.100s", filename,
+ strerror(errno));
+ buffer_free(&buffer);
+ close(fd);
+ return 0;
+ }
+
+ /* Check that it is at least big enough to contain the ID string. */
+ if (len < sizeof(authfile_id_string)) {
+ debug3("Bad RSA1 key file %.200s.", filename);
+ buffer_free(&buffer);
+ close(fd);
+ return 0;
+ }
+ /*
+ * Make sure it begins with the id string. Consume the id string
+ * from the buffer.
+ */
+ for (i = 0; i < sizeof(authfile_id_string); i++)
+ if (buffer_get_char(&buffer) != authfile_id_string[i]) {
+ debug3("Bad RSA1 key file %.200s.", filename);
+ buffer_free(&buffer);
+ close(fd);
+ return 0;
+ }
+
+ /* Read cipher type. */
+ cipher_type = buffer_get_char(&buffer);
+ (void) buffer_get_int(&buffer); /* Reserved data. */
+
+ /* Read the public key from the buffer. */
+ buffer_get_int(&buffer);
+ prv->n = BN_new();
+ buffer_get_bignum(&buffer, prv->n);
+ prv->e = BN_new();
+ buffer_get_bignum(&buffer, prv->e);
+ if (comment_return)
+ *comment_return = buffer_get_string(&buffer, NULL);
+ else
+ xfree(buffer_get_string(&buffer, NULL));
+
+ /* Check that it is a supported cipher. */
+ cipher = cipher_by_number(cipher_type);
+ if (cipher == NULL) {
+ debug("Unsupported cipher %d used in key file %.200s.",
+ cipher_type, filename);
+ buffer_free(&buffer);
+ goto fail;
+ }
+ /* Initialize space for decrypted data. */
+ buffer_init(&decrypted);
+ buffer_append_space(&decrypted, &cp, buffer_len(&buffer));
+
+ /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
+ cipher_set_key_string(&ciphercontext, cipher, passphrase);
+ cipher_decrypt(&ciphercontext, (u_char *) cp,
+ (u_char *) buffer_ptr(&buffer), buffer_len(&buffer));
+ memset(&ciphercontext, 0, sizeof(ciphercontext));
buffer_free(&buffer);
+
+ check1 = buffer_get_char(&decrypted);
+ check2 = buffer_get_char(&decrypted);
+ if (check1 != buffer_get_char(&decrypted) ||
+ check2 != buffer_get_char(&decrypted)) {
+ if (strcmp(passphrase, "") != 0)
+ debug("Bad passphrase supplied for key file %.200s.", filename);
+ /* Bad passphrase. */
+ buffer_free(&decrypted);
+fail:
+ BN_clear_free(prv->n);
+ prv->n = NULL;
+ BN_clear_free(prv->e);
+ prv->e = NULL;
+ if (comment_return)
+ xfree(*comment_return);
+ close(fd);
+ return 0;
+ }
+ /* Read the rest of the private key. */
+ prv->d = BN_new();
+ buffer_get_bignum(&decrypted, prv->d);
+ prv->iqmp = BN_new();
+ buffer_get_bignum(&decrypted, prv->iqmp); /* u */
+ /* in SSL and SSH p and q are exchanged */
+ prv->q = BN_new();
+ buffer_get_bignum(&decrypted, prv->q); /* p */
+ prv->p = BN_new();
+ buffer_get_bignum(&decrypted, prv->p); /* q */
+
+ ctx = BN_CTX_new();
+ aux = BN_new();
+
+ BN_sub(aux, prv->q, BN_value_one());
+ prv->dmq1 = BN_new();
+ BN_mod(prv->dmq1, prv->d, aux, ctx);
+
+ BN_sub(aux, prv->p, BN_value_one());
+ prv->dmp1 = BN_new();
+ BN_mod(prv->dmp1, prv->d, aux, ctx);
+
+ BN_clear_free(aux);
+ BN_CTX_free(ctx);
+
+ buffer_free(&decrypted);
+ close(fd);
+ return 1;
+}
+
+int
+load_private_key_ssh2(int fd, const char *passphrase, Key *k, char **comment_return)
+{
+ FILE *fp;
+ int success = 0;
+ EVP_PKEY *pk = NULL;
+ char *name = "<no key>";
+
+ fp = fdopen(fd, "r");
+ if (fp == NULL) {
+ error("fdopen failed");
+ close(fd);
+ return 0;
+ }
+ pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
+ if (pk == NULL) {
+ debug("PEM_read_PrivateKey failed");
+ (void)ERR_get_error();
+ } else if (pk->type == EVP_PKEY_RSA) {
+ /* replace k->rsa with loaded key */
+ if (k->type == KEY_RSA || k->type == KEY_UNSPEC) {
+ if (k->rsa != NULL)
+ RSA_free(k->rsa);
+ k->rsa = EVP_PKEY_get1_RSA(pk);
+ k->type = KEY_RSA;
+ name = "rsa w/o comment";
+ success = 1;
+#ifdef DEBUG_PK
+ RSA_print_fp(stderr, k->rsa, 8);
+#endif
+ }
+ } else if (pk->type == EVP_PKEY_DSA) {
+ /* replace k->dsa with loaded key */
+ if (k->type == KEY_DSA || k->type == KEY_UNSPEC) {
+ if (k->dsa != NULL)
+ DSA_free(k->dsa);
+ k->dsa = EVP_PKEY_get1_DSA(pk);
+ k->type = KEY_DSA;
+ name = "dsa w/o comment";
+#ifdef DEBUG_PK
+ DSA_print_fp(stderr, k->dsa, 8);
+#endif
+ success = 1;
+ }
+ } else {
+ error("PEM_read_PrivateKey: mismatch or "
+ "unknown EVP_PKEY save_type %d", pk->save_type);
+ }
+ fclose(fp);
+ if (pk != NULL)
+ EVP_PKEY_free(pk);
+ if (success && comment_return)
+ *comment_return = xstrdup(name);
+ debug("read SSH2 private key done: name %s success %d", name, success);
+ return success;
+}
+
+int
+load_private_key(const char *filename, const char *passphrase, Key *key,
+ char **comment_return)
+{
+ int fd;
+ int ret = 0;
+ struct stat st;
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ return 0;
+
+ /* check owner and modes */
+#ifdef HAVE_CYGWIN
+ if (check_ntsec(filename))
+#endif
+ if (fstat(fd, &st) < 0 ||
+ (st.st_uid != 0 && getuid() != 0 && st.st_uid != getuid()) ||
+ (st.st_mode & 077) != 0) {
+ close(fd);
+ error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
+ error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
+ error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
+ error("Bad ownership or mode(0%3.3o) for '%s'.",
+ st.st_mode & 0777, filename);
+ error("It is recommended that your private key files are NOT accessible by others.");
+ return 0;
+ }
+ switch (key->type) {
+ case KEY_RSA1:
+ if (key->rsa->e != NULL) {
+ BN_clear_free(key->rsa->e);
+ key->rsa->e = NULL;
+ }
+ if (key->rsa->n != NULL) {
+ BN_clear_free(key->rsa->n);
+ key->rsa->n = NULL;
+ }
+ ret = load_private_key_rsa1(fd, filename, passphrase,
+ key->rsa, comment_return); /* closes fd */
+
+ break;
+ case KEY_DSA:
+ case KEY_RSA:
+ case KEY_UNSPEC:
+ ret = load_private_key_ssh2(fd, passphrase, key,
+ comment_return); /* closes fd */
+ break;
+ default:
+ close(fd);
+ break;
+ }
+ return ret;
+}
+
+int
+do_load_public_key(const char *filename, Key *k, char **commentp)
+{
+ FILE *f;
+ char line[1024];
+ char *cp;
+
+ f = fopen(filename, "r");
+ if (f != NULL) {
+ while (fgets(line, sizeof(line), f)) {
+ line[sizeof(line)-1] = '\0';
+ cp = line;
+ switch(*cp){
+ case '#':
+ case '\n':
+ case '\0':
+ continue;
+ }
+ /* Skip leading whitespace. */
+ for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
+ ;
+ if (*cp) {
+ if (key_read(k, &cp) == 1) {
+ if (commentp)
+ *commentp=xstrdup(filename);
+ fclose(f);
+ return 1;
+ }
+ }
+ }
+ fclose(f);
+ }
+ return 0;
+}
+
+/* load public key from pubkey file */
+int
+try_load_public_key(const char *filename, Key *k, char **commentp)
+{
+ char pub[MAXPATHLEN];
+
+ if (do_load_public_key(filename, k, commentp) == 1)
+ return 1;
+ if (strlcpy(pub, filename, sizeof pub) >= MAXPATHLEN)
+ return 0;
+ if (strlcat(pub, ".pub", sizeof pub) >= MAXPATHLEN)
+ return 0;
+ if (do_load_public_key(pub, k, commentp) == 1)
+ return 1;
return 0;
- }
-
- /* Read cipher type. */
- cipher_type = buffer_get_char(&buffer);
- (void)buffer_get_int(&buffer); /* Reserved data. */
-
- /* Read the public key from the buffer. */
- buffer_get_int(&buffer);
- prv->n = BN_new();
- buffer_get_bignum(&buffer, prv->n);
- prv->e = BN_new();
- buffer_get_bignum(&buffer, prv->e);
- if (comment_return)
- *comment_return = buffer_get_string(&buffer, NULL);
- else
- xfree(buffer_get_string(&buffer, NULL));
-
- /* Check that it is a supported cipher. */
- if (((cipher_mask() | SSH_CIPHER_NONE | SSH_AUTHFILE_CIPHER) &
- (1 << cipher_type)) == 0)
- {
- debug("Unsupported cipher %.100s used in key file %.200s.",
- cipher_name(cipher_type), filename);
- buffer_free(&buffer);
- goto fail;
- }
-
- /* Initialize space for decrypted data. */
- buffer_init(&decrypted);
- buffer_append_space(&decrypted, &cp, buffer_len(&buffer));
-
- /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
- cipher_set_key_string(&cipher, cipher_type, passphrase, 0);
- cipher_decrypt(&cipher, (unsigned char *)cp,
- (unsigned char *)buffer_ptr(&buffer),
- buffer_len(&buffer));
-
- buffer_free(&buffer);
-
- check1 = buffer_get_char(&decrypted);
- check2 = buffer_get_char(&decrypted);
- if (check1 != buffer_get_char(&decrypted) ||
- check2 != buffer_get_char(&decrypted))
- {
- if (strcmp(passphrase, "") != 0)
- debug("Bad passphrase supplied for key file %.200s.", filename);
- /* Bad passphrase. */
- buffer_free(&decrypted);
- fail:
- BN_clear_free(prv->n);
- BN_clear_free(prv->e);
- if (comment_return)
- xfree(*comment_return);
- return 0;
- }
-
- /* Read the rest of the private key. */
- prv->d = BN_new();
- buffer_get_bignum(&decrypted, prv->d);
- prv->iqmp = BN_new();
- buffer_get_bignum(&decrypted, prv->iqmp); /* u */
- /* in SSL and SSH p and q are exchanged */
- prv->q = BN_new();
- buffer_get_bignum(&decrypted, prv->q); /* p */
- prv->p = BN_new();
- buffer_get_bignum(&decrypted, prv->p); /* q */
-
- ctx = BN_CTX_new();
- aux = BN_new();
-
- BN_sub(aux, prv->q, BN_value_one());
- prv->dmq1 = BN_new();
- BN_mod(prv->dmq1, prv->d, aux, ctx);
-
- BN_sub(aux, prv->p, BN_value_one());
- prv->dmp1 = BN_new();
- BN_mod(prv->dmp1, prv->d, aux, ctx);
-
- BN_clear_free(aux);
- BN_CTX_free(ctx);
-
- buffer_free(&decrypted);
-
- return 1;
}